Rotary jar



Aug. 9, 1932.

L. WELLS ROTARY JAR Filed Sept. 2, 1924 2 Sheets-Sheet l L13 M/IE )rELln'5 INVENTOR.

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Aug. 9, 1932.

Filed Sept. 2, 1924 L. WELLS ROTARY J AR 2 Sheets-Shoot 2 lfNNlf YELL-S INVENTOR.

ATTORNEY.

Patented Aug. 9, 1,32

. UNITED STATES I LENNIE WELLS, OF LONG BEACH, CALIFORNIA ROTARY JAB Application filed September 2, 1924. Serial No. 735,324.

My invention relates to'rotary jars for use in connection with an oil or other well drilling apparatus, and is adapted to be used to recover a lost tool or pipe, frozen or otherwise held in an earth stratum.

I-Ieretofore it has been proposed to provide a jar for an oil well in which said jar is only intermittently rotated, and the lost tool given but a single upward blow or shock.

13 Such devices have been found in practise to be quite unsatisfactory, since if said upward blow or shock is not effective to loosen the stuck drill or pipe, it will be impossible to recover same, necessitating the abandonment of the well.

With my improved jar, however, I provide a means whereby said jar may be continuously rotated, giving the stuck drill or pipe a succession of upward blows or shocks,

until said lost pipe or stuck drill have been recovered, thus insuring the success of the operation. a

It accordingly is an object of my invention to provide anovel form of device in 55 which a stuck drill or other device may be expeditiously and quickly removed from an earth stratum by continuously rotating a set of complementary elements, whereby said stuck drill or other device maybe given one or more upward blows or shocks, an impact member being also provided for nullifying the effect of said impact blow or shock, for the purpose of preventing injury or damage to said device.

The above and other objects of my invention I attain with tlie device constructed as shown in the drawings and described in the specification forming a part of my application.

Further objects and advantages of my apparatus will become more apparent as the description thereof proceeds.

Reference is had to the accompanying Fig. 3 is a cross-section ofFig. 1 on the line 3-3,

Fig. 4 is a fragmentary detail cross-sectional view of a modification,

Fig. 5 is a top plan view of one of the cam members, on a somewhat smaller scale than that shown in the other views, the casing being shown in section and the jar stem without a circulating medium passage,

Fig. 6 is a modified form of my rotating jar, showing alternative forms of jar hammer and jar impact receiving means,

Figs. 7 and 8 are elevational views ofthe split dimpact receiving means shown in Fig. 6, an

Fig. 9 is a vertical sectional view of the jar stem with fragmentary section of the wash pipe attached used with the form shown in fiescribing my invention more in detail, 1

indicates a sectional casing which is adapted to be continuously rotated by the draw works of an oil well or other well drilling apparatus, said casing being adapted to be secured to said apparatus by means of the threads 18.

Positioned within the casing 1 is a jar stem or inner member 3, which ar stem is adapted to be secured to the tool joint 17. The jar stem 3 has mounted thereon an upper member, which may be in the form of a screw threaded nut 7 of hexagonal or other shape, and which may either be integral with or removably or securely fixed to said jar stem. Said upper member or nut 7 is adapted to be intermittently positioned within the cavity G'oii similar shape formed in the cap 2 screwed or otherwise secured to the easing 1.

' As an additional securing means, and also to prevent any mutilation of the threads on the nut or upper member 7, when the jar stem is unscrewed from the tool joint 17, I have provided a pin or screw bolt 9, which may have asuitable lock nut, if desired, to hold the nut or upper member on the jar stem 3.

Projecting from the jar stem 3, and either integral therewith or secured thereto in any suitable manner, are one or more projections 10, upon which are mounted conical or other shaped rollers 11. Any number of such projections and rollers found desirable in practise may be used.

Said projections and rollers constitute one of the complementary members or devices 5 which eifect the sudden upward blows or shocks hereinafter more fully explained.

The other complementary member comprises the cam member 16 shown in Figs. 1 and 5,

which cam, member may either beintegral with the casing 1 or secured thereto in any suitable manner, permanently or removable.

The cam member 16 is provided with a suitable cam surface 18 and one or more vertical cut-away portions, so that when the rollers 11 are caused to ride over said cam surface, they will be made to drop into said cut-away portions, providing for a number of sudden upward blows or shocks for each revolution of the casing 1, There may be only one blow for each revolution of the casing or more, depending upon the number of cut-away portions used.

As shown in Fig. 4 the jar stem 3 may have integral therewith or secured thereto in any desirable manner, permanently or otherwise, a cam member 10, similar to the cam member 16, only reversed or inverted. This cam member 10' forms an alternative form to be used in place of therollers 11, if desired. Depending upon the number of cut-away portions used, one or more sudden upward blows or shocks may be given the jar stem 3 for each revolution of the casing 1.

The space in which the rollers 11 or th cams act is adapted to be provided with a suitable lubricant for reducing wear to a minimum and providing a means for lubricating the parts.

In order to revent the rollers or the cams 40 from being in ured due to the upward blows or shocks given the jar stem 3, I have provided a means whereby the impact of said blows or shocks may be received. For such a. purpose I have provided the jar hammer 4, w ich jar hammer is adapted to coact with the washer 5, removably positioned on the jar stem 3, and which washer may be replaced when worn. It is clear that both the washer and the jar hammer may be constructed of any suitable material of sufficient strength to withstand the effect of the succession of blows given the jar stem 3, thereby saving the rollers and cam members from injury.

The space in which the washer 5 acts may 5 also be provided'with a suitable lubricant for obvious purposes.

To provide a means in which a circulating medium may be passed through my rotating jar, such, for example, as the rotary mud used in drilling, or any other similar medium, I

have provided the cap 2 with a suitable passage for receiving the wash pipe 8, screwed or otherwise secured to the jar stem 3, which wash pipe is adapted to align with a passage 12 therein. To prevent the circulating .ately know that something had happened to cavity or socket 6,. and a rotary movement medium from entering the casing 1, I have provided said casing with a suitable packin gland 15, surrounding the wash pipe 8, an another such gland 14, surrounding the jar stem 3.

The operation of my rotating jar will now be clear. Should there ensue a sudden strain on the draw works, the' driller would immedithe drill tool. The drilling operation is then stopped, and my jar is lowered into the well, a suitable fishing tool having previously been applied to the tool joint 17. The nut or upper member 7 is now positioned within the is given the casing 1 until said fishing tool has securely grasped the stuck drill or pipe. An upward movement of the casing 1 will disengage the nut 7 from the cavity 6, and the rollers 11 and cam 16, or the two cams 10 and 16 will be placed in engagement.

' A strain having been placed on the easing by the draw works, and the jar stem being held stationary, the casing 1 is rotated continuously. The rollers will ride over the cam surface 13, or if the form in Fig. 4 is used, the two cam surfaces ride over each other until the vertical cut-away portions of said cam members have beenreached. At this movement either the roller reaching that position, or the upper cam, will allow the cam 16 and therefore'the casing 1 and its jar hammer to move upward with a snap giving the jar stem a sudden upward blow or shock, the impact of which is received by the jar hammer 4 and the washer 5.

The number of cut-away portions, of course, may be varied, which cut-away portions govern the number of blows per revolution, an adequate number of rollers being provided for this purpose.

Of course, any form of threads, either right or left handed, may be used on the jar stem or casing. In unscrewing the jar stem from the fishing tool, the pin or bolt 9 serves to prevent the threads on the nut 7 from being mutilated.

In the modifications shown in Figs. 6-9 inclusive, I have illustrated an outer casing 1', made in sectional form as shown, for convenient assembly and disassembly. In said figures I have shown the cam 16 with its cam surface 13 as integral with the outer casing 1. The jar hammer 4 has secured thereon by threads or otherwise a suitable cap 2, the threads 18 being adapted to be secured to the usual box joint associated with the well drilling apparatus.

Mounted within the outer casing 1' is a jar stem or inner member 3 provided with a suitable passage 12 for a circulating medium such, for example, as rotary mud, said passage having in alignment therewith a suitable wash pipe 8 secured to the jar stem 3 by means of screw threads or otherwise.

To prevent said circulating medium from entering the casing 1 I have provided a packing gland 15' surrounding the wash pipe 8, there being a similar packing gland 14: surrounding the lower end of the jar stem 3.

To receive the impact of the blows given the jar stem 3', I have provided a jar hammer 4, which may be secured in position on the casing 1 by means of threads, as shown,

- or otherwise. In this form of my invention,

instead of using a washer, I have provided the ar stem with projections 5 integral with or secured thereto in any suitable manner. Said projections 5 coact with the jar hammer 4" to receive the impact of the blows or shocks given to the jar stem 3.

The jar stem 3 has either integral therewith or secured thereto in any suitable manner a member or nut 7 of any suitable configuration, to be intermittently taken into a similar shaped cavity 6 provided in the head or cap 2. A suitable lubricant may be placed in the space in which the projections 5 act.

The jar stem 3 is provided with projections 10 upon which are mounted cone shaped rollers 11 for coacting with the cam surface 13 of the cam 16. It is clear, however, that any suitable form of rollers coacting with the cam surface 13' may be used.

The space in which the rollers 11 act may also be provided with a suitable lubricant.

The ar hammer 4 comprises a split member screw threaded at each end, to which the sections of the casing 1 is adapted to be secured. As shown, said jar hammer comprises two sections a and 12 adapted to embrace the jar stem 3', suitable holes or passages being provided to receive a pair of bolts or pins, provided, if desired, with well known form of lock washers and nuts to prevent displacement. The jar stem 3' is,

of course, adapted to be secured to the tool I joint 17 The operation of this form of my invention being similar to the other, no further explanation will be given.

While I have described my invention with great particularity, it is clear that it may be modified throughout a wide range. I therefore do not propose to be limited to the exact details of construction shown and described, but reserve the right to make any and all modifications thereof that fall within the scope of the appended claims.

I claim as my invention:

1. In an apparatus of the class described, in combination, a pair of relatively movable members, one of which is adapted to be held stationary while the other is adapted to have an upward strain placed thereon and continuously rotated through the arc of an entire circumference for subjecting said first member to one or more upward blows or shocks, each of said members being provided with means adapted to-icoact to produce said upward blows or shocks.

2. In a rotary jar, in combination, a casing adapted to be continuously rotated through an arc of an entire circumference and having an upward strain placed thereon, a jar stem in said casing adapted alternatively to be held stationary whensaid strain is placed on said casing so that said stem may be subjected to one or more upward blows or shocks, or rotated with said casing, and means on said casing and said jar stem adapted to coact to produce said upward blows or-shocks.

3. In a rotary jar, in combination, an outer sectional casing adapted to be continuously rotated through the arc of an entire circumference and to have an upward strain placed thereon, an inner member adapted to be held stationary when said casing is rotated and an upward strain placed thereon, or alternatively rotated with said casing, and cam means associated with said casing and said inner member, which means, when said casing has an upward strain placed thereon and continuously rotated will coact to subject said inner member to a succession of upward blows or shocks.

4. In a rotary jar comprising in combination two sections slackly linked together, means associated with both of said sections whereby they may be locked together so that they may be continuously rotated through an arc of an entire circumference, one of said sections being adapted to have an upward strain placed thereon and in that condition being unlocked and continuously rotated through an arc of an entire circumference, the other of said sections, when said first named sections is placed under a strain and continuously rotated, being adapted to be held stationary, and jarring means associated with both of said sections, said j arrng means functioning when said first section is continuously rotated and said second section held stationary.

5. In an apparatus of the class described, in combination, a pair of relatively movable members, one of which is adapted to be held stationary while the other is adapted to have an upward strain placed thereon and continuously rotated through an arc of an entire circumference for subjecting said first member to one or more upward blows or shocks, each of said members having means adapted to coact to produce said upward blows, and means associated with both of said members for neutralizing the effect of said upward I jected to one or more upward blows or shocks, or rotated with said casing, means on said casing and said jar stem adapted to produce said upward blows or shocks, and means associated with said casing and said jar stem for neutralizing the effect of said upward blows or shocks on said jar.

7. In a rotary jar comprising in combination two sections slackly linked together, means associated with both of said sections whereby they may be locked together so that they may be continuously rotated through an arc of an entire circumference, one of said sections being adapted to have an upward strain placed thereon, and in that condition being unlocked and continuously rotated through an arc of an entire circumference, the other of said sections, when said first named section is placed under strain and continuously rotated, being adapted to be held stationary, jarring means associated with both of said sections, said jarring means functioning when said first section is continuously rotated and said second section held stationary, and impact means associated with both of said sections for neutralizing the effect of said jarring means on said jar.

8. In a rotary jar, a sectional casing comprising a main cylindrical portion, a cup portion detachably associated with said main portion, a screw-threaded extension on said cap portion whereby said casing is adapted to be continually rotated, a cam member associated with the lower part of said main portion, an anvil member associated with the top of said main portion, a jar stem in said casing which casing is adapted to be continuously rotated about said jar stem, a second cam device on said jar stem, and means associated with said jar stem for securing said stem to a stuck tool or pipe, said cam member and cam device, when said stem is held stationary by said stuck tool or pipe and said casin continuously rotated about said jar stem 1n the arc of an entire circumference, being adapted to coact to subject said jar stem to a seriesof upward blows or shocks, which are neutralized b said anvil member.

9. n a rotary ar, a casing, means associated with said casing whereby it may be rotated, a jar stem in said casing, means on said stem whereby the latter may be secured to a stuck drill or pipe, and a set of complementary devices on said casing and said stem,

said devices, when said stem is held stationary by said stuck drill or pipe, and said casing rotated through the arc of an entire circumference, being adapted to snap together to give said jar stem and said stuck drill or pipe a succession of upward blows or shocks.

10. In a rotary jar, a casing, means associated with said casing whereby it may be a continuously rotated, a jar stem in said casing, means associated with said stem whereby it may be held statlonary, said casing being also provided with means in the upper portion thereof, whereby said jar stem may be held stationary with respect to said casing and rotated therewith so that said jar may be operated in drilling, and a set of complementary devices associated with-said casingvided with means whereby a circulating medium maybe passed therethrough, jarring means associated with said casing and said Jar stem, an anvil associated internally with said casing, a wear plate positioned on said I anvil and detachably associated with said ar stem and impact means associated with said jar stem for co-acting with said plate to neutralize the effect of said jarring means on said jar,

In testimony whereof I have signed my name to this specification.

LENNIE WELLS. 

